Dave Manby writes:

I always liked the way of describing grades as

grade 1 take the mother in law
grade 2 take the girlfriend
grade 3 take the wife
grade 4 take the mistress
grade 5 take the photographs
grade 6 take the mother-in-law

Change to suit your sex

Not sure that'll work; women might have intentions toward members of
the opposite sex that go beyond either wanting to impress them or
wanting to kill them. Just guessing...

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Mary Malmros
Some days you're the windshield,
Other days you're the bug.